I don't want to poop on your parade, but I suspect those leaves won't decompose enough by spring. But I'll say this: When you rake them into a compost pile in the spring, the lower layer will be full of worms. Leave some of that in place and till it in. The rest you will have to pile up in a corner somewhere, and let it compost through the summer. You'll get a lot of worms in the raked pile too, and the results will be magnificent.
As the summer progresses, you can start using it as mulch around your tomatoes and corn and other larger veggie plants. It will be heavy and wet, so not suited for mulching smaller stuff, but your tomatoes will love it. My corn always thrives with heavy mulching, and stuff like that is super for that. By next fall it will be perfect to till it all in.
What you have done is the best investment you can make for your garden!